Jan Zickermann authored Feb 19, 2023 and Georges Basile Stavracas Neto committed Feb 09, 2024

Previously, it was difficult to determine which monitor is which,
especially, with identical display names.

Now, a `ScreenCastGeometryContainer` is used to layout `GtkToggleButtons`
in a geometry which corresponds to the logical monitor layout.
The old monitor selection `GtkListBox` has been removed.

Additionally, the stack switcher for the source type
has been moved inside the dialog window.

Closes: #9